CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се от съседна мрежа, без особени условия, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req Syzbot reported a KASAN stack-out-of-bounds read in l2cap_build_cmd() that is triggered by a malformed Enhanced Credit Based Connection Request. The vulnerability stems from l2cap_ecred_conn_req(). The function allocates a local stack buffer (`pdu`) designed to hold a maximum of 5 Source Channel IDs (SCIDs), totaling 18 bytes. When an attacker sends a request with more than 5 SCIDs, the function calculates `rsp_len` based on this unvalidated `cmd_len` before checking if the number of SCIDs exceeds L2CAP_ECRED_MAX_CID. If the SCID count is too high, the function correctly jumps to the `response` label to reject the packet, but `rsp_len` retains the attacker's oversized value. Consequently, l2cap_send_cmd() is instructed to read past the end of the 18-byte `pdu` buffer, triggering a KASAN panic. Fix this by moving the assignment of `rsp_len` to after the `num_scid` boundary check. If the packet is rejected, `rsp_len` will safely remain 0, and the error response will only read the 8-byte base header from the stack.
Засегнати продукти
- Linux Linux: 935f324e4b2461df2cf7f02b4195082b4304c708 преди c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc; e981a9392800ce2c5bca196a6ab2c55e9370efaa преди 5b35f8211a913cfe7ab9d54fa36a272d2059a588; f3fdf2e7276a3edc5df55454275da20eac186970 преди a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b; c28d2bff70444a85b3b86aaf241ece9408c7858c преди 9d87cb22195b2c67405f5485d525190747ad5493
- Linux Linux: 6.12.75 преди 6.12.80; 6.18.16 преди 6.18.21; 6.19.6 преди 6.19.11
Вид слабост
История
- 22 април 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-31513
- https://nvd.nist.gov/vuln/detail/CVE-2026-31513
- https://git.kernel.org/stable/c/c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc
- https://git.kernel.org/stable/c/5b35f8211a913cfe7ab9d54fa36a272d2059a588
- https://git.kernel.org/stable/c/a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b
- https://git.kernel.org/stable/c/9d87cb22195b2c67405f5485d525190747ad5493